Gas burner



Jan. 2, 1923,

L. B. METTLER. GAs BURNER. FILED DEc.

61am nu;

LEE 3. METTLER, OI LOS ANGELES, CALIFORNIA. 3

GAS BURNER.

Application filed December 31, 1921. Serial No. 526,319.

T 0 all whomit may concern:

Be it known that I, LEE B. METTLER, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in a Gas Burner, of which the following is a specification.

My invention relates to a combination unit or gas burner of the low pressure type.

The primary object of my invention is to provide a construction in a gas burner of the type employing a metal gas box or manifold having a series of gas outlets, whereby the metal of the gas box and particularly that portion thereof adjacent to the gas outlets will be protected against burning out by i the action of the heat formed by the combustion of gas discharged thru the gas outblock in such manner as to break up the 001-- lets, and which obviates the employment of v nozzles or tubes projecting from the gas box. a

Another object is to provide a gas burner with a facing of refractory material, formed with apertures to register with gasoutlets of the burner, adapted to form mixing throats for effecting a mixture of gas and air within the aperture of the facing and to so construct the burner body that the air supplied to said apertures will be delivered thru the burner body so that the refractory facing may be arranged to contact the burner surface between the gas outlets.

Another object is. to provide a combustion unit embodying a gas box provided with a series of air tubes extending therethru, and a facing block formed of refractory material seating on the burner box and formed with apertures forming continua- 'tion's of the air tubes, in which gas will be 40- delivered from the gas box' at the intersection of the tubes and the apertures in the unm of air passing thru theftube's and insure-a thorough mixture of the gas and air, whereby. practically complete; combustion may be obtainedwith a steady flame so as to eliminate the vibration and surging ordi- -narily incident to the use of low pressure burners.

Another object .is to provide a protective facing for a gas burner whereby the gas burner may be employed in a combustion chamber provided with an oil burner so that the gas burner will not be burned out when the oil burner is in operation and in which the-burner and its protective facing are so constructed that the air supplied to the combustion chamber will be delivered gether with such other objects as may subsequently appear, my invention resides in the parts and combination, arrangement and construction of parts, as hereinafter more fully described and claimed and illustrated by way of example in the accompanying drawings in which:

Fig. 1 is a view in side elevation partly in vertical section of the-combustionflunit as seen on the line 1-1 of Fig. 2.

Fig. 2 is an end elevation-of the combustion unit with parts broken away to show the parts in section as seen on the line 22 of Fig. 1. v i

Fig. 3 is a detail illustrating the application'of the burner to a combustion chamber.

Figs. 4 and'5 are details in section illustrating modified forms of the burner ,orifices and air ducts.

Referring to the drawings more specifically, 5 indicates a gas box, which may be of any suitable outline but is here shown as circular in plan and comprising spaced front and rear walls 6 and 7 respectively connected together by a side wall 8 forming a gas chamber 9 to which gas is admitted thru a feed pipe 10 here shown as connected to the the gas box 5 with a series of air tubes 11 which extend across'the'gas chamber 9 and connect with the front andrear walls 6 and 7 with their ends opening thru the'walls; the open ends of the tubes in the wall 7 constituting air inlet openings 12' and the open ends of the tubes in the wall 6 constituting air outlet openings 13.

The margins of the outletiopeningsflare' formed with beveled faces 14 and leading from each beveled face is a series of gas outlets or orifices "15 which extend thru the wall formed by the juncture ofthe tube 11 with the wall 6 and are preferably inclined relative to the longitudinal center of the tube, and extend on planes that intersect each other ashort distance from the outer'face of the wall 6 at a point opposite the center of the air discharge opening.

An important feature of my invention resides in providing a facing block 16 adapted to extend over the outer surface of the wall 6 preferably in contact therewith; the facing block-being formed of a suitable refractory material. A series of apertures 17 are formed in the facing block and arranged to register with the discharge ends 13 of the air tubes to form a continuation of the latter; the apertures being of such length that the point of intersection of the planes of the gas orifices will be located intermediate to the ends of the apertures. The inner margin of each aperture adjacent the wall 6 is formed with a beveled face 18 extending opposite the beveled face 14 adjacent the discharge ends of the gas orifices 15 and serves to direct gas discharged from the orifices toward the center ofthe apertures so as to break up the column of air delivered from the air tubes thru the aperture. The apertures thus form mixing throats for insuring a thorough mixture of the gas'and' air before it passes from the aperture and whereby combustion may be caused to take place contiguous to the outer face of the refractory facing block. The facing block may be mounted on the burner box in any desired manner being here shown as supported on lugs 19 formed on the latter.

The facing block constitutes a protective body to prevent burning out of the burner box wall 6 the block 16 being formed of refractory material while the wall 6 is ordinarily composed of cast iron. This permits of the burner being employed as a combus-' tion un'itina combustion chamber 20 fitted with an oil burner 21, as the gasburner'will be protected by the facing block 16 against the action of the heat generated by the oil burnerwhen the latter is employed in lieu of the gas burner; the gas burner being further protected in this'instance by reason of the cooling action of the air flowing thru the air tubes 12 in supplying air to the combustion chamber.

The operation of the invention is apparent from the foregoing, it being seen that as gas is admitted to the gas box under the usual pressure the gas will be discharged thru the orifices 15 and directed inwardly toward the center of the aperture 17 where it thoroughly intermixes with air in the apertures 17 and flows from the latter. This flow of gas will act to draw air thru the air tubes for supplying the air to eflect proper gas and air mixture. Combustion of the mixture will occur ordinarily close to the outer face of the I facing block.

I flowing By providing the combustion unit with a seriesof discharge apertures arranged close together an intermingling of the mixture" from adjacent apertures may occur.

before combustion takes place. By providing'a series of gas orifices for each discharge ma e 14 becoming excessively heated during operation of the burner by reason of the protection afi'orded by the refractory facing block and also by the flow of air thru the tubes which absorbes heat radiated by the walls of the tubes and while thus acting, to cool the tubes is itself heated so as to. facilitate its mixture with the gas. f so The air tubes 11 are preferably slightly tapered to converge from the inlet opening 12 to the discharge opening 13 and the apertures l7 slightly diverge from their intersection With the air tubes, butin some instances it may be desirable to form the tubes and apertures with a decided taper as shown in F 1g. 4 to give a Venturi tube efi'ect.

In some instances the apertures 17 may be formed of a larger diameter than the outlet opening 13 and the gas orifices 15 arranged to open thru the end wall ,6 as shown in Fig. 5.

Various other forms and arrangements of the air passages, apertures and gas outlets may be employed as occasion may requireand I therefore do not limit myself-to the exact-details of construction and arrange ment shown, but may'employ such changes and modifications of the appended claims, without departure from the spirit of my invention.

I claim 5 l 1. Tn a combustion unit, a gas box having spaced front and back walls connected by fices opening to the aperture in "the facing I block. I 2. In acombustion unit, a gas box having spaced front and back wallsfetficted by side and end walls forming a'gas chamber,a series-of tubes extending between and back walls and opening therethru for-m- I ing air passages from on'es'ide of the gasbox to the other, and a facing block'of refractory material seated on and extending over the front wall of the box and having apertures 1 2 5 opening to the tubes, said'tubes being formed with a-s'eries of gas discharge orifices ope'ning to the aperture-in the facing block, said orifices 'being inclined relative 'to'the longi tudinal center of the tube with their'bores' 13o as come within the scope 106.

the front extending on a plane intersecting the center line of the aperture intermediate the inner and outer faces of the block.

3. In a combustion unit, an open ended air tube, a gas chamber surrounding the walls of the tube, and a block of refractory material abutting against one end of the tube and having an aperture opposite the open end of the tube, the wall of the tube being formed with a series of gas discharge orifices adjacent the block and opening to the aperture in the latter at an inclination to the center line thereof.

4c, In a combustion unit, a gas box having a series of open ended air tubes passing therethru and formed with a series of gas outlets-arranged around the margin of each air tube, and a facing block of refractory material seating on said gas box and having a series of apertures registering with the air tubes forming a continuation thereof and into which the gas outlets discharge.

5. In a combustion unit, a gas box having a series of open ended air tubes passing therethru, each tube being formed with a beveled face on the margin of its discharge end'and provided with a series of gas outlets opening on the beveled face and leading at an incline into the interior of the gas box, and a facing block formed of refractory material seatingon and covering the side of the gas box to'which the gas outlets open,

said block formed with a series of apertures registering with the tubes, each of said apertures being formed with a beveled face at its inner margin extending over the gas outlets whereby gas discharged from the outlets will'be directed toward the center of the aperture to break up the column of air flowing thru the air tube and efi'ect a mixture of gas and air in the space bounded by the wall of the aperture.

LEE B. METTLER; 

